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1/ i would make the ground move and leave the char' in the center, but there is no real best way it's all about what you like.

2/ yes. On a large map this can save your CPU's life

3/ I would lode them with AS. With all the other code you need using frames or scenes will just make it harder

4/ it's is totally dependent on whether they have code attached or how complicated they are, in it self it's a meaningless number, unless you where thinking of loading pixels individually (don't do that)

5/ tiles, using tiles can make things so much simpler, if you tell a tile there is some thing over it when you move it there all you need to do is ask the tile if there is anything to test for saving a lot of computations

i don't really understand, but i'll try anyway. you will need to add the tiles with AS or is no longer useful.
This is one of the most used/recommended tile tutorial. Have a look I might help youhttp://www.tonypa.pri.ee/tbw/start.html

I have been writing a tile-based game and one of the problems I had was how to effectively load up external tile gifs. I found that, using flash's bitmapData class, I was able to load my external tiles into separate movieclips, draw them into a bitmapData array, then delete the holder movieclips. This allows me to then use the .attachBitmap function which allows the game to only have to load tiles once, then access them until the game is closed or the array is deleted.

If enough people are interested, I can set up a custom class and post it.

I have been writing a tile-based game and one of the problems I had was how to effectively load up external tile gifs. I found that, using flash's bitmapData class, I was able to load my external tiles into separate movieclips, draw them into a bitmapData array, then delete the holder movieclips. This allows me to then use the .attachBitmap function which allows the game to only have to load tiles once, then access them until the game is closed or the array is deleted.

If enough people are interested, I can set up a custom class and post it.

This is the best and by far the most efficent way to make a tile based game now a days. Just have to be careful redrawing the animated tiles.